/*
 * Created on Mar 1, 2010
 * Created by Paul Gardner
 * 
 * Copyright (C) Azureus Software, Inc, All Rights Reserved.
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License only.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 */

package com.aelitis.azureus.core.util;

import org.gudy.azureus2.core3.disk.DiskManagerFileInfo;
import org.gudy.azureus2.core3.download.DownloadManager;
import org.gudy.azureus2.core3.util.AEThread2;

public class LaunchManager {
    private static LaunchManager singleton = new LaunchManager();

    public static LaunchManager getManager() {
        return (singleton);
    }

    private CopyOnWriteList<LaunchController> controllers = new CopyOnWriteList<LaunchController>();

    public void launchRequest(final LaunchTarget target, final LaunchAction action) {
        new AEThread2("LaunchManager:request") {
            public void run() {
                for (LaunchController c : controllers) {

                    try {
                        c.handleRequest(target);

                    } catch (Throwable e) {

                        action.actionDenied(e);

                        return;
                    }
                }

                action.actionAllowed();
            }
        }.start();
    }

    public LaunchTarget createTarget(DownloadManager dm) {
        return (new LaunchTarget(dm));
    }

    public LaunchTarget createTarget(DiskManagerFileInfo fi) {
        return (new LaunchTarget(fi));
    }

    public void addController(LaunchController controller) {
        controllers.add(controller);
    }

    public void removeController(LaunchController controller) {
        controllers.remove(controller);
    }

    public class LaunchTarget {
        private DownloadManager dm;
        private DiskManagerFileInfo file_info;

        private LaunchTarget(DownloadManager _dm) {
            dm = _dm;
        }

        private LaunchTarget(DiskManagerFileInfo _file_info) {
            file_info = _file_info;
            dm = file_info.getDownloadManager();
        }

        public DownloadManager getDownload() {
            return (dm);
        }

        public DiskManagerFileInfo getFile() {
            return (file_info);
        }
    }

    public interface LaunchController {
        public void handleRequest(LaunchTarget target)

        throws Throwable;
    }

    public interface LaunchAction {
        public void actionAllowed();

        public void actionDenied(Throwable reason);

    }
}
